BetterCms.Module.MediaManager.Services.DefaultMediaImageService.CreatePngThumbnail C# (CSharp) Метод

        private void CreatePngThumbnail(Stream sourceStream, Stream destinationStream, Size size)
        {
            using (var image = Image.FromStream(sourceStream))
            {
                Image destination = image;

                var diff = (destination.Width - destination.Height) / 2.0;
                if (diff > 0)
                {
                    var x1 = Convert.ToInt32(Math.Floor(diff));
                    var y1 = 0;
                    var x2 = destination.Height;
                    var y2 = destination.Height;
                    var rect = new Rectangle(x1, y1, x2, y2);
                    destination = ImageHelper.Crop(destination, rect);
                }
                else if (diff < 0)
                {
                    diff = Math.Abs(diff);

                    var x1 = 0;
                    var y1 = Convert.ToInt32(Math.Floor(diff));
                    var x2 = destination.Width;
                    var y2 = destination.Width;
                    var rect = new Rectangle(x1, y1, x2, y2);
                    destination = ImageHelper.Crop(destination, rect);
                }

                destination = ImageHelper.Resize(destination, size);

                destination.Save(destinationStream, ImageFormat.Png);
            }
        }